枚举应用案例（个人比较喜欢）

package com.atsico.pkg0805.pg03;

public enum Size {

SMALL("S"),
MEDIUM("M"),
LARGE("L"),
EXTRA_LARGE("XL");

private String var;

private Size(String var) {
this.var = var;
}

public String getVar(){
return var;
}

}

package com.atsico.pkg0805.pg03;

public class RunMainForEmun {

public static void main(String[] args) {
Size s = Enum.valueOf(Size.class, "SMALL");
System.out.println(s.getVar());
if (s == Size.SMALL) {
System.out.println("Good Job!");
}
}

}